I have never had a crush in my life. I don’t know if this is normal for INTJs. I’m quite aware it’s plain unusual in general, though.
My brother, also an INTJ, might have had a few crushes on girls at school when we were younger, but that might have just been young lust. I can’t remember him actually talking about how he liked a girl’s personality or interests, just her looks.
Lust I know well. Crushes, hm. But at the end of the day, what is a crush? By definition it is ephemeral, and generally the object of the crush can never be had by the beholder anyway. As I understand it, it’s the love of love, the love of an idea of a person, and not a true affection and appreciation of them.
That’s not to say I’m not romantic, nor that other INTJs aren’t. I’m simply uncertain if our brains are wired correctly to really facilitate a crush, and not just a vague liking. Perhaps we’re just too innately practical. I mean, I vaguely like several of my male friends. I would probably go out with them if they were so inclined. Am I swooning over them, though, and does my heart beat wildly at the thought of them, and can I only envision myself in a relationship with them? Not at all. (And for the record, I’ve never been able to envision myself in a relationship at all. Take it how you will.)
It certainly sounds like he likes you, though. He wouldn’t volunteer his time for you if he didn’t. And really, crushes come and go, and the puppy dog affection quickly becomes tiring for everybody involved. It’s not the basis for any healthy relationship, I think, to dote so much and know each other so little. No, I think what you have is better than that, more solid.